When a for statement is executed, a cursor is implicitly declared such that for each iteration of the for loop, the next row is the result set if fetched.

在执行for语句时，游标被隐式声明，这样对于FOR循环的每一次迭代，取回的下一行就是结果集。

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You will recall that DataTables execute an implicit loop over their rows, and the var attribute indicates the value of the current row during the iteration.

您将再次调用 DataTables 对各表行执行隐式循环，var 属性指示迭代过程中的当前行。

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On each iteration, db2_result gets the value for each field within the row.

在每次迭代中，db 2 _ result将获取行内每个字段的值。

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